Shunsuke Fukami
Dynamics of collective magnetic structures induced by electrical means has been of paramount interest in magnetics and spintronics research, and many interesting phenomena have been revealed, leading to various opportunities of applications. Non-collinear antiferromagnet with chiral-spin structure is an attractive system showing intriguing properties that were believed to be inherent to ferromagnets such as the anomalous Hall effect [1]. Here I discuss physics and functionalities of Mn3Sn, a representative room-temperature noncollinear antiferromagnetic system. First, I will show an epitaxial thin-film growth technique that is necessary to explore the device functionalities [2] and show basic magneto-transport properties [2,3]. Then, I will show a chiral-spin rotation induced by spin-orbit torque under electric current application [4] and discuss its opportunities for high-frequency devices beyond GHz. If time allows, I will also present our recent studies on the domain structure [5] and thermal stability [6] of Mn3Sn thin film and nanodot.
This work is performed under a collaboration with Y. Takeuchi, J.-Y. Yoon, T. Uchimura, Y. Sato, Y. Yamane, J. Han, S. Kanai, J. Ieda, and H. Ohno. This study is partly supported by JSPS Kakenhi 19H05622, MEXT X-NICS JPJ011438, and RIEC Cooperative Research Projects.
[1] S. Nakatsuji et al., Nature 527, 212 (2015). [2] J.-Y. Yoon et al., Appl. Phys. Express 13, 013001 (2019) [3] J.-Y. Yoon et al. AIP Adv. 11, 065318 (2021). [4] Y. Takeuchi et al., Nature Materials 20, 1364 (2021). [5] T. Uchimura et al., Appl. Phys. Lett. 120, 172405 (2022). [6] Y. Sato et al., Appl. Phys. Lett. 122, 122404 (2023).